Knots

Clove Hitch

A clove hitch is an extremely useful and quick knot. It has the advantage of being very quick to tie and untie, but it doesn’t hold nearly as well as the bowline. On sailboats, one of its most common uses is hanging the fenders over the side as you come in to dock.
Bowline

The bowline is the king of sailing knots. It has been in use by sailors continuously for at least 500 years. Simply put, the bowline is way of turning the end of your line into a loop. Why is this useful? You can tie it around a post or other fixed object to make the line fast, or on smaller boats it is used fasten the halyard to the sail. It can also be used to tie two lines together. It has a number of practical uses as well, such as hanging a hammock. Under pressure the bowline tightens, so it won’t give way. However, note that it’s impossible to untie while bearing a large load.